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Note 2 - Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2020				2019				2020				2019
Research and development		$	935			$	386			$	2,682			$	972
General and administrative			1,870				411				5,887				881
Cost of goods sold			350				-				1,218				-
Total share-based compensation expense		$	3,155			$	797			$	9,787			$	1,853

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
		2020				2019				2020				2019
Dividend yield			-				-				-				-
Expected volatility			87%			90%	-	91%		87%	-	91%		80%	-	91%
Risk-free interest rate		0.33%	-	0.44%		1.59%	-	1.89%		0.33%	-	1.87%		1.59%	-	2.64%
Expected life (in years)		5.38	-	6.25		5.38	-	6.25		5.38	-	10		5.38	-	10
Weighted-average grant date fair value per share			12.46				5.66				12.05				5.14

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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